Beckett Family of Texas

My grandfather was James Martin Beckett, son of J.C. (Joshua Calvin) Beckett, son of Calamise Beckett. My grandfather had siblings named: John, Florence, Almira, Mary, Lemuel, Samuel, Laura and Jessie. He died when my mother was 12 and she lost all ties with that side of her family.We have a few old pictures and a letter written by J.C. Beckett to his son James Martin, around 1930 when he was sheriff of Brackettville, Texas.We would like to obtain as much information on the family as possible and see if anyone may know who the people are in the pictures we have.We would appreciate any information anyone would be willing to share.